Charles w



(No Model.)

0. W. CUTTER.

GUUNTERSINK ATTACHMENT FOR AUGERS.

Patented Jan. 24, 1882.

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CHAR-LES lV. CUTTER, OF ERIE, PENNSYLVANIA, ASSIGNOR OF 0NE-HALF TO URlAH E. LEMON, OF SAME PLACE.

COUNTERSINK ATTACHMENT FOR AUGERS.

SPECIFICATION forming part of Letters Patent No. 252,650, dated January 24, 1882.

Application filed August 26, 1881. (No model.)

To all whom it may concern:

Be it known that I, OHAnLEs W. CUTTER, a citizen of the United States, a resident of Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvementsin Oountersink;Ontters; and I do hereby declare that the followingis a full, clear, and exact description thereof, reference being had to the accompanying drawings and the letters or figures of reference marked thereon.

Countersinks have heretofore been made of two semi-cylimlrical parts having semi-cylindrical inner depressions which nearly encircle the auger. The fitting of these depressions upon the auger required great care, else they would be liableto slip and the hole bored be of greater depth than was intended. The cutting-edges in this form were also so placed that they could not be sharpened without removing the clamps from the auger. To remove the gage it became necessary to unscrew the clamping-screw wholly from the device before the removal could be accomplished.

To obviate these difficulties is the object of my invention; and to that end the nature of it C(llllSES, first, of clamping-plates made of flat pieces of metal placed opposite to each otherupon an anger and held in place by clampin g-screws located on each side of the auger, and having its cutting-edges located so that they can be sharpened without removing the clamping-plates from the auger; second, of a gage held in place between the clamping-screws by the head of the same, and adapted to be moved by simply loosening and not removing the screws, third, in providing the gage with a broad base or foot to prevent the body from bending upon itself \vhen the pressure is very great; and, fourth, of parts and combination of parts that will hereinafter be described, and pointed out in the claims.

Figure 1 is a perspective elev..tion. Fig. 2 is a side elevation. Fig. 3 is a cross-section on the line at x in Fig. 2.

The letters of reference indicate parts as follows: A is the bit or drill. '13 B are the countersink-cutting plates. 0 O are the clampingsercws; D, the adjustable gage; a, a groove on the inside of each plate, to make it cling or clutch to the drill and prevent the cutter from revolving around the drill. l) 1) b are the cutting-edges of the plates B; d, the foot of the gage D. a

The construction of my device is as follows: The plates B B are made of proper metal, and may be of such shape as may be desired; but each must have a cutting-edge, b, which, when the plates are properly adjusted, will set at such an angle to the axis of the'drill as to give the proper form to the countersink-cavity. The inclined faces, which terminate at edges b, are upon the outer face of the plate, so that a file can be used to sharpen the edges without removing the plates from the auger.

'This is an obvious advantage over the form now in use, forthe reason that the cylindrical clamps must be removed whenever it is desired to sharpen them. In Fig. 1 these cuttingedges are clearly seen, the one on the right of 76 said figure presenting its front to view and the other its back or bevel. On the back of each plate B is asmall groove, a, which prevents the cutter slipping around on the drill when cuttingthecountersink. Theplatesaresecured t0 the drill by being clamped thereon by the screws 0 0. However, some other form of clamping device may be used, if desired.

D is the gage above referred to. l t is clearly shown in Fig. 1. It is attached and adjusted 80 by slipping under the heads of the clampingscrews 0 0. It may, however, be attachedand made adjustable by a separate screw, it'desired. When the foot d of this gage comes in contact with the surface of the article being bored, further ingress of the bit and cutter is prevented.

' The operation is as follows: The operator, knowing the depth of hole to be drilled, adjusts the gage at the proper distance from the point 0 0f the drill, and, knowing the size of the head of the screw to be used, he adjusts the gage D the proper distance from the point of the cutter.

What I claim as new is- 1. A countersink-cutter made of two flat pieces having their cutting-edges located as shown, and for the purpose set forth, in com- I the gage without removing the screws, all substantially as and for the purposes set forth.

3. A countersink-cutter consisting of two lates having their cutting-faces located as shown, a gage provided with an imperforate body, and all held in place by clxmping-screws placed on each side of the auger, substantially in the manner described, and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 1st day of August,

CHARLES V. CUTTER.

Witnesses:

JNO. K. HALLOGK, URIAH E. LEMON. 

